02-01294 [Hellenic Literary and Historical Archive: 1937 ΠΑΝ ΙΣΤ]
P. D. Panagopoulos, Istoria tis neoteras Ellados dia tin ektin taxin tou Dimotikou Scholiou, ed. , Dimitrakos A.E., Athina 1937, Hellenic Literary and Historical Archive

03-20561212 [Library of the Hellenic Parliament: 20561212]
P. A. Panagopoulos, Istoria tis Neoteras Ellados dia tin 6in taxin tou Dimotikou Scholiou, ed. , Dimitrakos A. E., Athina 1933, Library of the Hellenic Parliament